Datasheet
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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
GQL OR ZQL PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
21 3 4 65
K
GRD OR ZRD PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
21 3 4 65
SN74LVCHR16245A
16-BIT BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS582P – NOVEMBER 1996 – REVISED DECEMBER 2005
This device can be used as two 8-bit transceivers or one 16-bit transceiver. It allows data transmission from the
A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR)
input. The output-enable ( OE) input can disable the device so that the buses are effectively isolated.
All outputs, which are designed to sink up to 12 mA, include equivalent 26- Ω series resistors to reduce overshoot
and undershoot.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
TERMINAL ASSIGNMENTS
(1)
(56-Ball GQL/ZQL Package)
1 2 3 4 5 6
A 1DIR NC NC NC NC 1 OE
B 1B2 1B1 GND GND 1A1 1A2
C 1B4 1B3 V
CC
V
CC
1A3 1A4
D 1B6 1B5 GND GND 1A5 1A6
E 1B8 1B7 1A7 1A8
F 2B1 2B2 2A2 2A1
G2B3 2B4 GND GND 2A4 2A3
H 2B5 2B6 V
CC
V
CC
2A6 2A5
J 2B7 2B8 GND GND 2A8 2A7
xxxxx
K 2DIR NC NC NC NC 2 OE
(1) NC – No internal connection
TERMINAL ASSIGNMENTS
(1)
(54-Ball GRD/ZRD Package)
1 2 3 4 5 6
A 1B1 NC 1DIR 1 OE NC 1A1
B 1B3 1B2 NC NC 1A2 1A3
C 1B5 1B4 V
CC
V
CC
1A4 1A5
D 1B7 1B6 GND GND 1A6 1A7
E 2B1 1B8 GND GND 1A8 2A1
F 2B3 2B2 GND GND 2A2 2A3
G 2B5 2B4 V
CC
V
CC
2A4 2A5
H 2B7 2B6 NC NC 2A6 2A7
J 2B8 NC 2DIR 2 OE NC 2A8
(1) NC – No internal connection
2